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author | Amaury Decrême <amaury.decreme@gmail.com> | 2013-01-29 01:21:08 +0400 |
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committer | Wolfram Sang <wolfram@the-dreams.de> | 2013-02-11 18:59:39 +0400 |
commit | a6e7d0efe0e21091682f62c4a72707a1adeef8ea (patch) | |
tree | e4b28da46a07d0f7ba310db039be686dd64325d4 /drivers/i2c | |
parent | 499b9194ad7b7b6d7c06b01005508e5bcf3c8980 (diff) | |
download | linux-a6e7d0efe0e21091682f62c4a72707a1adeef8ea.tar.xz |
i2c: sis630: use hex to constants for SMBus commands
This patch replaces hexadecimal values by constants for SMBus commands.
Signed-off-by: Amaury Decrême <amaury.decreme@gmail.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/i2c-sis630.c | 45 |
1 files changed, 31 insertions, 14 deletions
diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c index e152d36b94ac..b2fa7415f7e4 100644 --- a/drivers/i2c/busses/i2c-sis630.c +++ b/drivers/i2c/busses/i2c-sis630.c @@ -81,6 +81,21 @@ #define SMB_COUNT 0x07 /* byte count */ #define SMB_BYTE 0x08 /* ~0x8F data byte field */ +/* SMB_STS register */ +#define BYTE_DONE_STS 0x10 /* Byte Done Status / Block Array */ +#define SMBCOL_STS 0x04 /* Collision */ +#define SMBERR_STS 0x02 /* Device error */ + +/* SMB_CNT register */ +#define MSTO_EN 0x40 /* Host Master Timeout Enable */ +#define SMBCLK_SEL 0x20 /* Host master clock selection */ +#define SMB_PROBE 0x02 /* Bus Probe/Slave busy */ +#define SMB_HOSTBUSY 0x01 /* Host Busy */ + +/* SMBHOST_CNT register */ +#define SMB_KILL 0x20 /* Kill */ +#define SMB_START 0x10 /* Start */ + /* register count for request_region * As we don't use SMB_PCOUNT, 20 is ok for SiS630 and SiS964 */ @@ -140,12 +155,14 @@ static int sis630_transaction_start(struct i2c_adapter *adap, int size, u8 *oldc int temp; /* Make sure the SMBus host is ready to start transmitting. */ - if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) { - dev_dbg(&adap->dev, "SMBus busy (%02x).Resetting...\n",temp); + temp = sis630_read(SMB_CNT); + if ((temp & (SMB_PROBE | SMB_HOSTBUSY)) != 0x00) { + dev_dbg(&adap->dev, "SMBus busy (%02x). Resetting...\n", temp); /* kill smbus transaction */ - sis630_write(SMBHOST_CNT, 0x20); + sis630_write(SMBHOST_CNT, SMB_KILL); - if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) { + temp = sis630_read(SMB_CNT); + if (temp & (SMB_PROBE | SMB_HOSTBUSY)) { dev_dbg(&adap->dev, "Failed! (%02x)\n", temp); return -EBUSY; } else { @@ -160,16 +177,16 @@ static int sis630_transaction_start(struct i2c_adapter *adap, int size, u8 *oldc /* disable timeout interrupt , set Host Master Clock to 56KHz if requested */ if (high_clock) - sis630_write(SMB_CNT, 0x20); + sis630_write(SMB_CNT, SMBCLK_SEL); else - sis630_write(SMB_CNT, (*oldclock & ~0x40)); + sis630_write(SMB_CNT, (*oldclock & ~MSTO_EN)); /* clear all sticky bits */ temp = sis630_read(SMB_STS); sis630_write(SMB_STS, temp & 0x1e); /* start the transaction by setting bit 4 and size */ - sis630_write(SMBHOST_CNT,0x10 | (size & 0x07)); + sis630_write(SMBHOST_CNT, SMB_START | (size & 0x07)); return 0; } @@ -183,7 +200,7 @@ static int sis630_transaction_wait(struct i2c_adapter *adap, int size) msleep(1); temp = sis630_read(SMB_STS); /* check if block transmitted */ - if (size == SIS630_BLOCK_DATA && (temp & 0x10)) + if (size == SIS630_BLOCK_DATA && (temp & BYTE_DONE_STS)) break; } while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT)); @@ -193,12 +210,12 @@ static int sis630_transaction_wait(struct i2c_adapter *adap, int size) result = -ETIMEDOUT; } - if (temp & 0x02) { + if (temp & SMBERR_STS) { dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); result = -ENXIO; } - if (temp & 0x04) { + if (temp & SMBCOL_STS) { dev_err(&adap->dev, "Bus collision!\n"); result = -EAGAIN; } @@ -217,8 +234,8 @@ static void sis630_transaction_end(struct i2c_adapter *adap, u8 oldclock) * restore old Host Master Clock if high_clock is set * and oldclock was not 56KHz */ - if (high_clock && !(oldclock & 0x20)) - sis630_write(SMB_CNT,(sis630_read(SMB_CNT) & ~0x20)); + if (high_clock && !(oldclock & SMBCLK_SEL)) + sis630_write(SMB_CNT, sis630_read(SMB_CNT) & ~SMBCLK_SEL); dev_dbg(&adap->dev, "SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT)); } @@ -270,7 +287,7 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat we must clear sticky bit. clear SMBARY_STS */ - sis630_write(SMB_STS,0x10); + sis630_write(SMB_STS, BYTE_DONE_STS); } rc = sis630_transaction_wait(adap, SIS630_BLOCK_DATA); @@ -312,7 +329,7 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat dev_dbg(&adap->dev, "clear smbary_sts len=%d i=%d\n",len,i); /* clear SMBARY_STS */ - sis630_write(SMB_STS,0x10); + sis630_write(SMB_STS, BYTE_DONE_STS); } while(len < data->block[0]); } |